“The cake is made up of lemon sponge, it has an elderflower syrup drizzle on the sponge.”

First image of the Royal Wedding cake [Instagram/Royal Family]

“It has an Amalfi lemon curd and then it has a Swiss meringue buttercream with elderflower,” she continued.

The cake differs from the two cakes that Prince William and Kate Middleton had at their 2011 nuptials, a traditional multi-tiered fruit cake and a chocolate cake.

Claire also revealed that the cake won’t be assembled until the big day: “We will assemble it in-situ at Windsor Castle on Saturday morning.”Claire Ptak is baking the cake at Buckingham Palace [Instagram/Royal Family]

Claire hard at work [Instagram/Royal Family]

Final details will also be added at the last minute.

“And then add the flowers, because they obviously need to be added at the last moment.

“Where the buttercream is sweet, the lemon curd is very tart,” Claire said, describing the cake’s taste. “So you get a really lovely thing happening when you take a bite, which is to get all of those flavours and sensations.”

Final details, including flowers, will be added to the cake at the last minute [Instagram/Royal Family]

“Hopefully it’s perfectly balanced!” she added.

Claire also expressed that her and her team have been “so lucky to work at Buckingham Palace to bake the cake and ice the cakes.”